Sex drive is low i just made 40 female?

Must be a reason: Making 40 for a women generally isn't a reason for loss of sex drive. Just having children, economical or emotional stress, conflict in personal or family relationships, active or chronic medical problems, recent or past trauma or loss, being without a regular partner, undiagnosed mental health problems all can affect libido. Has some past sexual trauma come to light? Talk to your doctor.

Seek medical eval: A review of potential medication side effects, hormone levels and a physical exam will guide what the problem is. If everything is normal, it might be an issue that psychotherapy or couples therapy needs to address.

Low sex drive: Possibilities are psychological, medical (hormones) or medications (prescribed or illicit substances).